LP8345CDT-5.0/NOPB [TI]
5V FIXED POSITIVE LDO REGULATOR, 0.4V DROPOUT, PSSO2, DPAK-3;
| 型号： | LP8345CDT-5.0/NOPB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 5V FIXED POSITIVE LDO REGULATOR, 0.4V DROPOUT, PSSO2, DPAK-3 输出元件 调节器 |
| 文件： | 总12页 (文件大小：189K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OBSOLETE
LP8345
www.ti.com
SNVS229F –FEBRUARY 2003–REVISED APRIL 2013
Low Dropout, Low IQ, 500mA CMOS Linear Regulator
Check for Samples: LP8345
1
FEATURES
DESCRIPTION
The LP8345 low-dropout CMOS linear regulator are
2
•
•
•
•
•
•
•
•
•
•
±1.5% Typical VOUT Tolerance
210mV Typical Dropout @ 500mA (VO = 5V)
Wide Operating Range 2.7V to 10V
Internal 500mA PMOS Output Transistor
19µA Typical Quiescent Current
Thermal Overload Limiting
available in 5V, 3.3V, 2.5V, 1.8V or adjustable output
versions. Packaged in our 6ld WSON package and
3ld DPAK they can deliver up to 500mA output
current.
Typical dropout voltage @ 500mA is 210mV for the
5.0V version, 270mV for the 3.3V version and 335mV
for the 2.5V version.
Foldback Current Limiting
The devices include a zener trimmed bandgap
voltage reference, foldback current limiting and
thermal overload limiting.
Zener Trimmed Bandgap Reference
Space Saving WSON package
Temperature Range
The LP8345 features a PMOS output transistor which
unlike PNP type low dropout regulators requires no
base drive current. This allows the device ground
current to remain less than 50µA over operating
temperature, supply voltage and irrespective of the
load current.
–
–
LP8345C 0°C to 125°C
LP8345I −40°C to 125°C
APPLICATIONS
•
•
•
•
Hard Disk Drives
Notebook Computers
Battery Powered Electronics
Portable Instrumentation
TYPICAL APPLICATIONS
Fixed VOUT
Adjustable VOUT
3.3V
1.5V
V
OUT
V
IN
V
V
OUT
IN
V
V
IN
OUT
1.0µF
Ceramic
1.0µF
Ceramic
1.0µF
Ceramic
1.0µF
Ceramic
25k
V
Sense
OUT
(LLP only)
ADJ
125k
GND
GND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2013, Texas Instruments Incorporated
OBSOLETE
LP8345
SNVS229F –FEBRUARY 2003–REVISED APRIL 2013
www.ti.com
CONNECTION DIAGRAMS
6-Pin WSON
FIXED OUTPUT VOLTAGE
6-Pin WSON
ADJUSTABLE OUTPUT VOLTAGE
V
1
V
1
N/C
3
GND
2
N/C
3
IN
IN
GND
2
PIN 1 ID
PIN 1 ID
HEATSINK
is GND
HEATSINK
is GND
6
5
4
6
5
4
V
V
ADJ
IN
OUT
V
V
V
OUT
IN
OUT
Sense
Figure 1. Bottom View
Figure 2. Bottom View
NOTE
VIN Pins (Pin 1 & 6) must be connected together externally for full 500mA operation
(250mA max per pin).
VOUT Sense (Pin 5) must be connected to VOUT (Pin 4).
PFM
Figure 3. Top View
2
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SNVS229F –FEBRUARY 2003–REVISED APRIL 2013
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS(1) (2)(3)
VIN, VOUT, VOUT Sense, ADJ
Storage Temperature Range
Junction Temperature (TJ)
Power Dissipation
−0.3V to 12V
−65°C to 160°C
150°C
(4)
(5)
ESD Rating
Human Body Model
Machine Model
2kV
200V
(1) Absolute Maximum ratings indicate limits beyond which damage may occur. Electrical specifications do not apply when operating the
device outside of its rated operating conditions.
(2) All voltages are with respect to the potential at the ground pin.
(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
T
- T
A
J(MAX)
P
D
=
q
JA
(4) Maximum Power dissipation for the device is calculated using the following equations:
where TJ(MAX) is the maximum
junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. The value of the θJA for the
WSON package is specifically dependant on the PCB trace area, trace material, and the number of layers and thermal vias. For
improved thermal resistance and power dissipation for the WSON package, refer to Application Note AN-1187 (literature number
SNOA401).
(5) Human body model 1.5kΩ in series with 100pF.
OPERATING RATINGS(1) (2)
Supply Voltage
2.7 to 10V
0°C to 125°C
Temperature Range
LP8345C
LP8345I
−40°C to 125°C
(1) Absolute Maximum ratings indicate limits beyond which damage may occur. Electrical specifications do not apply when operating the
device outside of its rated operating conditions.
(2) All voltages are with respect to the potential at the ground pin.
LP8345C ELECTRICAL CHARACTERISTICS
Unless otherwise specified all limits specified for VIN = VO+ 1V, CIN = COUT = 10μF, TJ = 25°C. Boldface limits apply over the
full operating temperature range of TJ = 0°C to 125°C
Symbol
VIN
Parameter
Input Voltage
Conditions
Min(1)
2.7
Typ(2)
Max(1)
Units
LP8345-ADJ,1.8, 2.5
LP8345-3.3, 5.0
10
10
V
VOUT
Output Voltage
LP8345-ADJ, ADJ = OUT
IOUT = 10mA, VIN = 2.7V, TJ = 25°C
100μA ≤IOUT≤ 500mA, 2.7V ≤VIN≤VOUT +4V
1.231
1.213
1.250
<br/>
1.269
1.288
V
V
V
V
V
LP8345-1.8
IOUT = 10mA, VIN = 2.8V, TJ = 25°C
100μA ≤IOUT ≤500mA, 2.8V ≤VIN≤6V
1.773
1.746
1.800
<br/>
1.827
1.854
LP8345-2.5
IOUT = 10mA, VIN = 3.5V, TJ = 25°C
100μA ≤IOUT ≤500mA, 3.5V ≤VIN ≤6.5V
2.463
2.425
2.500
<br/>
2.538
2.575
LP8345-3.3
IOUT = 10mA, VIN = 4.3V TJ = 25°C
100μA ≤IOUT ≤500mA, 4.3V ≤VIN ≤7.5V
3.250
3.201
3.300
<br/>
3.350
3.399
LP8345-5.0
IOUT = 10mA, VIN = 6V, TJ = 25°C
100μA ≤IOUT ≤500mA, 6V ≤VIN ≤9V
4.925
4.850
5.000
<br/>
5.075
5.150
(1) All limits are specified by testing or statistical analysis.
(2) Typical Values represent the most likely parametric norm.
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LP8345C ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise specified all limits specified for VIN = VO+ 1V, CIN = COUT = 10μF, TJ = 25°C. Boldface limits apply over the
full operating temperature range of TJ = 0°C to 125°C
Symbol
Parameter
Load Regulation
Conditions
Min(1)
Typ(2)
Max(1)
20
Units
ΔVO
LP8345-ADJ, ADJ=OUT
6
IOUT = 1mA to 500mA, VIN = 2.7V
LP8345-1.8
IOUT = 1mA to 500mA, VIN = 2.8V
7
9
20
30
35
40
LP8345-2.5
IOUT = 1mA to 500mA, VIN = 3.5V
mV
LP8345-3.3
IOUT = 1mA to 500mA, VIN = 4.3V
12
14
LP8345-5.0
IOUT = 1mA to 500mA, VIN = 6V
ΔVO
Line Regulation
VOUT + 0.5V ≤VIN ≤10V, IOUT = 25mA(3)
4
15
mV
mV
V
IN − VO Dropout Voltage(3) (4)
LP8345-2.5
IOUT = 500mA
335
650
LP8345-3.3
LP8345-ADJ, VOUT = 3.3V, IOUT = 500mA
270
210
19
500
400
LP8345-5.0
IOUT = 500mA
IQ
Quiescent Current
V
V
V
V
IN ≤10V
50
μA
μA
Minimum Load Current
Foldback Current Limit
IN − VOUT ≤4V
IN − VOUT >5V
IN − VOUT <4V
100
ILIMIT
450
1200
55
mA
dB
Ripple Rejection Ratio
VIN (dc) = VOUT + 2V
48
VIN (ac) = 1VP-P @ 120Hz
TSD
Thermal Shutdown Temp.
Thermal Shutdown Hyst.
160
10
°C
nA
ADJ Input Leakage Current VADJ = 1.5V or 0V
±0.01
±100
10
VOUT Leakage Current
LP8345-ADJ
ADJ = OUT, VOUT = 2V, VIN = 10V
LP8345-1.8, VOUT = 2.5V, VIN = 10V
LP8345-2.5, VOUT = 3.5V, VIN = 10V
LP8345-3.3, VOUT = 4V, VIN = 10V
LP8345-5.0, VOUT = 6V, VIN = 10V
10Hz to 10kHz, RL = 1kΩ, COUT = 10μF
10
10
10
10
μA
en
Output Noise
250
μVrms
(3) Condition does not apply to input voltages below 2.7V since this is the minimum input operating voltage.
(4) Dropout voltage is measured by reducing VIN until VO drops 100mV from its normal value.
LP8345I ELECTRICAL CHARACTERISTICS
Unless otherwise specified all limits specified for VIN = VO+ 1V, CIN = COUT = 10μF, TJ = 25°C. Boldface limits apply over the
full operating temperature range of TJ = −40°C to 125°C
Symbol
VIN
Parameter
Input Voltage
Conditions
Min(1)
Typ(2)
Max(1)
Units
LP8345-ADJ,1.8, 2.5
LP8345-3.3, 5.0
2.7
10
10
V
(1) All limits are specified by testing or statistical analysis.
(2) Typical Values represent the most likely parametric norm.
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LP8345I ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise specified all limits specified for VIN = VO+ 1V, CIN = COUT = 10μF, TJ = 25°C. Boldface limits apply over the
full operating temperature range of TJ = −40°C to 125°C
Symbol
Parameter
Output Voltage
Conditions
Min(1)
Typ(2)
Max(1)
Units
VOUT
LP8345-ADJ, ADJ = OUT
IOUT = 10mA, VIN = 2.7V, TJ = 25°C
100μA ≤IOUT≤ 500mA, 2.7V ≤VIN≤VOUT +4V
1.231
1.213
1.250
<br/>
1.269
1.288
V
LP8345-1.8
IOUT = 10mA, VIN = 2.8V, TJ = 25°C
100μA ≤IOUT ≤500mA, 2.8V ≤VIN≤6V
1.773
1.746
1.800
<br/>
1.827
1.854
V
V
V
V
LP8345-2.5
IOUT = 10mA, VIN = 3.5V, TJ = 25°C
100μA ≤IOUT ≤500mA, 3.5V ≤VIN ≤6.5V
2.463
2.425
2.500
<br/>
2.538
2.575
LP8345-3.3
IOUT = 10mA, VIN = 4.3V TJ = 25°C
100μA ≤IOUT ≤500mA, 4.3V ≤VIN ≤7.5V
3.250
3.201
3.300
<br/>
3.350
3.399
LP8345-5.0
IOUT = 10mA, VIN = 6V, TJ = 25°C
100μA ≤IOUT ≤500mA, 6V ≤VIN ≤9V
4.925
4.850
5.000
<br/>
5.075
5.150
ΔVO
Load Regulation
LP8345-ADJ, ADJ=OUT
6
20
IOUT = 1mA to 500mA, VIN = 2.7V
LP8345-1.8
7
20
IOUT = 1mA to 500mA, VIN = 2.8V
LP8345-2.5
IOUT = 1mA to 500mA, VIN = 3.5V
9
30
mV
LP8345-3.3
IOUT = 1mA to 500mA, VIN = 4.3V
12
14
4
35
LP8345-5.0
IOUT = 1mA to 500mA, VIN = 6V
40
ΔVO
Line Regulation
VOUT + 0.5V ≤VIN ≤10V, IOUT = 25mA
15
mV
mV
(3)
VIN − VO Dropout Voltage
LP8345-2.5
IOUT = 500mA
335
270
210
19
650
500
400
(3) (4)
LP8345-3.3
LP8345-ADJ, VOUT = 3.3V, IOUT = 500mA
LP8345-5.0
IOUT = 500mA
IQ
Quiescent Current
V
V
V
V
IN ≤10V
50
μA
μA
Minimum Load Current
Foldback Current Limit
IN − VOUT ≤4V
IN − VOUT >5V
IN − VOUT <4V
100
ILIMIT
450
1200
55
mA
dB
Ripple Rejection Ratio
VIN (dc) = VOUT + 2V
48
VIN (ac) = 1VP-P @ 120Hz
TSD
Thermal Shutdown Temp.
Thermal Shutdown Hyst.
160
10
°C
nA
ADJ Input Leakage Current VADJ = 1.5V or 0V
±0.01
±100
10
VOUT Leakage Current
LP8345-ADJ
ADJ = OUT, VOUT = 2V, VIN = 10V
LP8345-1.8, VOUT = 2.5V, VIN = 10V
LP8345-2.5, VOUT = 3.5V, VIN = 10V
LP8345-3.3, VOUT = 4V, VIN = 10V
LP8345-5.0, VOUT = 6V, VIN = 10V
10Hz to 10kHz, RL = 1kΩ, COUT = 10μF
10
10
10
10
μA
en
Output Noise
250
μVrms
(3) Condition does not apply to input voltages below 2.7V since this is the minimum input operating voltage.
(4) Dropout voltage is measured by reducing VIN until VO drops 100mV from its normal value.
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TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified, VIN = VO + 1.5V, CIN = COUT = 10μF X7R ceramic, TJ = 25°C
Output Voltage Change vs. Temperature
1.00
Dropout Voltage vs. Load Current
400
300
0.50
0.00
-0.50
-100
3.3V
2.5V
200
100
0
5.0V
0
200
300
400
500
0
25
50
75
100
125
100
TEMPERATURE (°C)
LOAD CURRENT (mA)
Figure 4.
Figure 5.
Ground Current vs. Temperature (ILOAD = 500mA)
Ground Current vs. Load Current
20
19
18
17
16
15
19
18.5
0°C
25°C
18
17.5
17
125°C
0
100
200
300
400
500
0
25
50
75
100
125
LOAD CURRENT (mA)
TEMPERATURE (°C)
Figure 6.
Figure 7.
Ground Current vs. Input Voltage
Ripple Rejection Ratio vs. Frequency
22
21
20
19
18
60
50
40
30
20
10
0
17
16
1k
2.5
5
7.5
10
12.5
10
100
10k
100k
INPUT VOLTAGE (V)
FREQUENCY (Hz)
Figure 8.
Figure 9.
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise specified, VIN = VO + 1.5V, CIN = COUT = 10μF X7R ceramic, TJ = 25°C
Load Transient Response
Line Transient Response
V
OUT
(50mV/DIV)
V
(100mV/DIV)
OUT
I
(10mA to 500mA)
OUT
V
IN
(4.0V to 5.0V)
200µs/DIV
200µs/DIV
Figure 10.
Figure 11.
Start-up Response
Minimum Input Voltage Rise Time
10
C
OUT
= 1µF
V
OUT
(2V/DIV)
C
= 4.3µF
OUT
1
0.1
C
OUT
= 10µF
V
(0 to 5.0V)
IN
V
V
= 10V
IN
OUT
= 1µF
= 1.25V
C
IN
50µs/DIV
OVERSHOOT < 5%
0.01
1
10
0.1
100
I
(mA)
LOAD
Figure 12.
Figure 13.
Minimum Input Voltage Rise Time
Minimum Input Voltage Rise Time
10
1
10
V
V
= 10V
IN
OUT
= 1µF
C
= 1µF
OUT
= 2.5V
C
IN
OVERSHOOT < 5%
C
= 1µF
OUT
C
= 4.3µF
OUT
1
0.1
C
= 10µF
OUT
C
OUT
= 10µF
0.1
V
V
= 10V
IN
OUT
= 1µF
C
= 4.3µF
OUT
= 1.8V
C
IN
OVERSHOOT < 5%
0.01
0.01
1
10
1
10
0.1
100
0.1
100
I
(mA)
I
(mA)
LOAD
LOAD
Figure 14.
Figure 15.
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise specified, VIN = VO + 1.5V, CIN = COUT = 10μF X7R ceramic, TJ = 25°C
Minimum Input Voltage Rise Time
Minimum Input Voltage Rise Time
10
1
10
1
V
V
= 10V
V
V
= 10V
IN
OUT
= 1µF
IN
= 3.3V
= 5V
OUT
C
C
= 1µF
IN
OVERSHOOT < 5%
IN
C
= 1µF
OVERSHOOT < 5%
OUT
C
= 1µF
OUT
C
OUT
= 10µF
C
= 10µF
OUT
C
OUT
= 4.3µF
0.1
0.1
C
OUT
= 4.3µF
0.01
0.01
1
10
1
10
0.1
100
0.1
100
I
(mA)
I
(mA)
LOAD
LOAD
Figure 16.
Figure 17.
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APPLICATIONS SECTION
GENERAL INFORMATION
The LP8345 is a low-dropout, low quiescent current linear regulator. As shown in Figure 18 it consists of a 1.25V
reference, error amplifier, MOSFET driver, PMOS pass transistor and for the fixed output versions, an internal
feedback network (R1/R2). In addition, the device is protected from overload by a thermal shutdown circuit and a
foldback current limit circuit.
The 1.25V reference is connected to the inverting input of the error amplifier. Regulation of the output voltage is
achieved by means of negative feedback to the non-inverting input of the error amplifier. Feedback resistors R1
and R2 are either internal or external to the device, depending on whether it is a fixed voltage version or the
adjustable version. The negative feedback and high open loop gain of the error amplifier cause the two inputs of
the error amp to be virtually equal in voltage. If the output voltage changes due to load changes, the error
amplifier and MOSFET driver provide the appropriate drive to the pass transistor to maintain the error amplifier’s
inputs as virtually equal.
V
IN
P
-
MOSFET
DRIVER
ERROR
AMP
P
+
FOLDBACK CURRENT
LIMIT
V
OUT
DPAK Only
V
OUT
SENSE
R
1
Fixed V
OUT
R
2
1.25V
REFERENCE
THERMAL SHUTDOWN
Adjustable
Version
GND
ADJ
Figure 18. LP8345 Functional Block Diagram
EXTERNAL CAPACITOR
An Input capacitor of 1μF or greater is required between the LP8345 VIN pin and ground. While 1μF will provide
adequate bypassing of the VIN supply larger values of input capacitor (i.e. 10μF) can provide improved bypassing
of power supply noise.
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Stable operation can be achieved with an output capacitor of 1μF or greater, either ceramic X7R dielectric or
aluminum/tantalum electrolytic. While the minimum capacitor value is 1μF, the typical output capacitor values
selected range from 1μF to 10μF. The larger values provide improved load-transient response, power supply
rejection and stability.
OUTPUT VOLTAGE SETTING (ADJ VERSION ONLY)
The output voltage is set according to the amount of negative feedback (Note that the pass transistor inverts the
feedback signal). This feedback is determined by R1 and R2 with the resulting output voltage represented by the
following equation:
R
1
1
V
=
V
O
+
REF
R
2
(1)
Use the following equation to determine the values of R1 and R2 for a desired VOUT (R2 = 100kΩ is
recommended).
V
1.25
V
O
1
R
=
-
R
1
2
(2)
MINIMUM LOAD CURRENT
A minimum load of 100μA is required for regulation and stability over the entire operating temperature range. If
actual load current fall below 100μA it is recommended that a resistor of value RL =VO/100μA be placed between
VO and ground.
START UP CONSIDERATIONS
Under certain operating conditions, overshoot of VOUT at start-up can occur. The observed overshoot is a
function of rise time of VIN waveform, COUT, start-up load current, and VIN−VOUT differential. The relationship
between these conditions is shown in the Typical Performance Characteristics curves (Minimum Input Voltage
Rise Time). VIN rise times above the curve result in <5% overshoot.
Customers are encouraged to check the suitability of LP8345 in their specific application.
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REVISION HISTORY
Changes from Revision E (April 2013) to Revision F
Page
•
Changed layout of National Data Sheet to TI format .......................................................................................................... 10
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